Upgrade to Module-Build-0.2808

[p5sagit/p5-mst-13.2.git] / lib / base.pm

diff --git a/lib/base.pm b/lib/base.pm
index 04a8aa9..8bcbb5f 100644 (file)
--- a/lib/base.pm
+++ b/lib/base.pm
@@ -2,7 +2,7 @@ package base;
 
 use strict 'vars';
 use vars qw($VERSION);
-$VERSION = '2.04';
+$VERSION = '2.09';
 
 # constant.pm is slow
 sub SUCCESS () { 1 }
@@ -38,11 +38,26 @@ sub get_attr {
     return $Fattr->{$_[0]};
 }
 
-sub get_fields {
-    # Shut up a possible typo warning.
-    () = \%{$_[0].'::FIELDS'};
+if ($] < 5.009) {
+    *get_fields = sub {
+       # Shut up a possible typo warning.
+       () = \%{$_[0].'::FIELDS'};
+       my $f = \%{$_[0].'::FIELDS'};
 
-    return \%{$_[0].'::FIELDS'};
+       # should be centralized in fields? perhaps
+       # fields::mk_FIELDS_be_OK. Peh. As long as %{ $package . '::FIELDS' }
+       # is used here anyway, it doesn't matter.
+       bless $f, 'pseudohash' if (ref($f) ne 'pseudohash');
+
+       return $f;
+    }
+}
+else {
+    *get_fields = sub {
+       # Shut up a possible typo warning.
+       () = \%{$_[0].'::FIELDS'};
+       return \%{$_[0].'::FIELDS'};
+    }
 }
 
 sub import {
@@ -56,6 +71,10 @@ sub import {
     my $inheritor = caller(0);
 
     foreach my $base (@_) {
+        if ( $inheritor eq $base ) {
+            warn "Class '$inheritor' tried to inherit from itself\n";
+        }
+
         next if $inheritor->isa($base);
 
         if (has_version($base)) {
@@ -63,26 +82,31 @@ sub import {
              unless defined ${$base.'::VERSION'};
         }
         else {
-            local $SIG{__DIE__} = 'IGNORE';
-            eval "require $base";
-            # Only ignore "Can't locate" errors from our eval require.
-            # Other fatal errors (syntax etc) must be reported.
-            die if $@ && $@ !~ /^Can't locate .*? at \(eval /;
-            unless (%{"$base\::"}) {
-                require Carp;
-                Carp::croak(<<ERROR);
+           my $sigdie;
+           {
+               local $SIG{__DIE__};
+               eval "require $base";
+               # Only ignore "Can't locate" errors from our eval require.
+               # Other fatal errors (syntax etc) must be reported.
+               die if $@ && $@ !~ /^Can't locate .*? at \(eval /;
+               unless (%{"$base\::"}) {
+                   require Carp;
+                   Carp::croak(<<ERROR);
 Base class package "$base" is empty.
     (Perhaps you need to 'use' the module which defines that package first.)
 ERROR
-
-            }
+               }
+               $sigdie = $SIG{__DIE__};
+           }
+           # Make sure a global $SIG{__DIE__} makes it out of the localization.
+           $SIG{__DIE__} = $sigdie if defined $sigdie;
             ${$base.'::VERSION'} = "-1, set by base.pm"
               unless defined ${$base.'::VERSION'};
         }
         push @{"$inheritor\::ISA"}, $base;
 
         if ( has_fields($base) || has_attr($base) ) {
-           # No multiple fields inheritence *suck*
+           # No multiple fields inheritance *suck*
            if ($fields_base) {
                require Carp;
                Carp::croak("Can't multiply inherit %FIELDS");
@@ -137,10 +161,9 @@ sub inherit_fields {
         }
     }
 
-    unless( keys %$bfields ) {
-        foreach my $idx (1..$#{$battr}) {
-            $dattr->[$idx] = $battr->[$idx] & INHERITED;
-        }
+    foreach my $idx (1..$#{$battr}) {
+       next if defined $dattr->[$idx];
+       $dattr->[$idx] = $battr->[$idx] & INHERITED;
     }
 }
 
@@ -178,15 +201,32 @@ it, <base> will define $VERSION in the base package, setting it to the string
 C<-1, set by base.pm>.
 
 Will also initialize the fields if one of the base classes has it.
-Multiple inheritence of fields is B<NOT> supported, if two or more
+Multiple inheritance of fields is B<NOT> supported, if two or more
 base classes each have inheritable fields the 'base' pragma will
 croak.  See L<fields>, L<public> and L<protected> for a description of
 this feature.
 
+=head1 DIAGNOSTICS
+
+=over 4
+
+=item Base class package "%s" is empty.
+
+base.pm was unable to require the base package, because it was not
+found in your path.
+
+=back
+
 =head1 HISTORY
 
 This module was introduced with Perl 5.004_04.
 
+Attempting to inherit from yourself generates a warning:
+
+ use Foo;
+ use base 'Foo';
+
+ # Class 'Foo' tried to inherit from itself
 
 =head1 CAVEATS